Mode

Shutter speed

Application

 

 

ECS

DVW-790WS:

For shooting subjects such as

 

 

(Extended

248 speeds in the range of

monitor screens with vertical

 

 

Clear Scan)

30.4 Hz to 58.3 Hz

scanning frequencies of up to

 

 

(For DVW-

 

60 Hz (DVW-790WS) or up to

 

 

DVW-790WSP:

 

 

790WS/

50 Hz (DVW-790WSP), to

 

 

295 speeds in the range of

 

 

790WSP

obtain images with no horizontal

 

 

25.4 Hz to 48.7 Hz

 

 

only)

bands of noise.

 

 

 

4

EVS

DVW-707/709WS/790WS:

Improved vertical resolution.

(Enhanced

1/60 sec. (automatic

The sensitivity of the CCD is

 

Vertical

setting)

reduced to about half.

Definition) DVW-707P/709WSP/ 790WSP: 1/50 sec. (automatic setting)

Notes

•Whatever the operating mode of the electronic shutter, the sensitivity of the CCD decreases with increasing shutter speed.

•When the automatic iris is used, the iris opens wider and wider as the shutter speed increases, thus reducing the depth of field.

•Under artificial light, particularly fluorescent or mercury lamps, the light intensity may appear to be constant, but the strengths of each of the R, G and B colors are actually changing in synchronization with the frequency of the power supply (“flicker”). Using an electronic shutter under such lighting could make the flicker even worse. Color flicker is particularly likely to happen when the power supply is 60 Hz (with the DVW-707/709WS/790WS) or 50 Hz (with the DVW-707P/709WSP/ 790WSP). However, if the power frequency is 50 Hz (DVW-707/ 709WS/790WS) or 60 Hz (DVW-707P/709WSP/790WSP), setting the shutter speed to 1/100 or 1/60 can reduce this flicker.

4-14Chapter 4 Adjustments and Settings for Recording